As a player, ads are something that will make me uninstall a game immediately 9 times out of 10. I realize I might be in the minority, but the google playstore is already riddled with ads and in-app-purchase riddled low quality crapware/shovelware games and seeing ads makes me assign the game to that category.
I have better things to do with my time and attention than to sell it to "free" games that in turn sell it to advertising companies.
I know it's a hot take, but I advise you to explore other ways to monetize your game. Whether it's cosmetic or QoL features, or asking for donations here on itch or on a platform like ko-fi or patreon. You could even set up patreon rewards like early access to updates and voting on new features and being involved in thd development. If your game is good and you build a stable following, this might become more profitable than ads.